Radon: The Silent Home Invader That Can Kill

Because a house's radon level depends on many variables -- the composition of the soil, the construction of the house -- experts warn that any house might have high levels of the gas.

"Even if you have a new home, you might have high radon," said Bruce Snead, an extension specialist at Kansas State University specializing in radiation and indoor air quality. "The only way to know is to test."

The EPA recommends that any homeowner should conduct a radon test. The tests are easy to obtain. They're sold at hardware stores, and some local health departments and extension services offer to sell them at cost to homeowners, Snead said.

"People can test a home on their own," he said. "All they have to do is purchase a test kit, and read and follow the instructions."

The U.S. Surgeon General has recommended that people test their homes for radon every two years, and retest any time they move, make structural changes to the home or occupy a previously unused level of a house.

Homeowners also can hire a radon expert to come in and test levels, an action that some states require as part of a home sale, Snead said. About 20 states have laws requiring notification of radon levels in real estate transactions, and more are considering it, he said.

"Just as lead is a required notification, should the same thing happen with radon?" Snead said.

If high levels of radon are discovered, a relatively low-cost home repair can alleviate the problem, Snead said. The EPA recommends hiring a qualified radon mitigation contractor to do the work, because lowering high radon levels requires specific technical knowledge and special skills.

The most common method of radon reduction is called soil suction. It prevents radon from entering your home by drawing the radon from below the house and venting it through a pipe, or pipes, to the air above the house where it is quickly diluted, Snead said.

"The pipe discharges above the roof line, so this well-known carcinogen will dissipate into the atmosphere," he said. The pipes can work either passively, or with a fan used to pull air from the soil.

The average cost of a radon reduction system is about $1,200, according to the EPA. The cost generally ranges from $800 to $2,500, depending on the characteristics of the house and choice of radon-reduction methods.

Some homes now are being built to be radon-resistant, with gas-resistant foundations and sub-slab fill materials that allow gases to move easily away, Snead said.

Snead recommends that everyone, homeowner or renter, be proactive in dealing with the radon that could be building up in their homes.

"We save lives by having tests done and performing mitigation, and by building houses that are radon-resistant," he said.

More information

To learn more, visit the U.S. Environmental Protection Agency.

SOURCES: Kristy Miller, spokeswoman, U.S. Environmental Protection Agency's Office of Radiation and Indoor Air; Bruce Snead, extension specialist, Kansas State University, Manhattan